The most valuable upgrade for Ender 3 is the installation of the motor dampers!
Just believe me. I have printed a lot of mods and most of them are good looking but add almost nothing to the actual printer's characteristics. That is not true for the dampers! You will experience shocking difference in the quietness and a good improvement in ringing-free surfaces at the same print speed.
Let's get through it step by step:
Extruder damper - the easiest to install, no need for extra printed parts, just find 2 short M3 bolts (you are going to need a pair for each damper). This one is actually not a must.
Z-axis damper support: here's my design for it, including detailed instructions: https://www.thingiverse.com/thing:3383222
X and Y-axis dampers - the most important two. New Ender 3 mostly comes with press-fit pulleys on X and Y so you need to print a few parts. This guy made a working design for Y-axis: https://www.thingiverse.com/thing:3245255, however I made a few important corrections to the main body and posted it as a remix. You can find it here: https://www.thingiverse.com/thing:3421203
Now let's get to the point.
X-axis damper. Take it, print, install and enjoy :-)
The design consists of three parts. The main plate is a must print. It is designed for the motor with the damper to be installed at a calculated angle so when you tighten the belt it should stand straight and the belt will not wear.
You will need 1x nema17 damper. You can buy these in large internet store for $1-2. I would prefer this: https://www.banggood.com/Shock-Absorber-Stepper-Vibration-Damper-for-Nema17-Stepper-Motor-p-1188070.html?rmmds=detail-left-hotproducts__2&HotRecToken=ChQxMDA1Mjg0NTYwMDkxOTQzNDQyNRACGgJJViICUEQoAA&cur_warehouse=CN with the large inner diameter but his one: https://www.banggood.com/Shock-Absorber-Stepper-Vibration-Damper-for-Nema17-Stepper-Motor-p-1064910.html?cur_warehouse=CN also will do if you are ready to work it out with a jig saw like I did. I also recommend printing and installing X and Y tensioners: https://www.thingiverse.com/thing:2986144
Please download a new cover here: https://www.thingiverse.com/thing:3271077 the guy made a great design and that inspired me to enhance it using my ideas and creality opensource files for the printer. If you want to make custom writing on it like I did just let me know in the comments and I will make update.
The two small parts add a nice feature of precise adjustment of the Z axis. I found it very useful when you need to change a building plate or the nozzle. You will need 1 M4x20 bolt that comes spare with your ptinter. When you adjust the bed leveling just turn the bolt, bearing in mind that M4 has 0.7mm step/turn. I made the bolt holder separate for you to decide wheter to print it or not and change easy in case of thread wear. The second part is needed to move the limit wsitch to the front just under the screw.
A few important notes:
- I reinforced the crucial parts of the main plate, but anyway I recommend printing this one at 100% infill.
- I have printed the small part with the thread up to improve it's quality. I printed it with 0.25mm nozzle, but I am pretty sure 0.4 also will do the job.
- If you are using cura 3.6.0 please remember to set the infill pattern gyroid even if it is set to 100% because it's the only way to get the proper ironing. It's cura's bug.
- when connected via damper, the motor can't dissipate the heat through the metal frame and is getting very hot! You will need a passive cooler at least for X and Y axis motors!
- you don't have to print the z limit switch holder with 100% infill but you should set the walls count to 4+ otherwise the part can break when you attach it firmly to the frame
- screw the z bolt in and out a few times before assembling. It doesn't need to be very tight. If it becomes loose you can always print and change that small piece.
- increased space between horizontal rails
- added angle tuning plates 0.8, 1.3, 2.1 mm
these are designed to be printed with 0.2 mm first layer and 0.16 mm layer height 100% infill. Stackable. Just insert it into the main plate before installation. Mind the direction of the thick part! You might need them to fine tune your damper's angle in case your damper is different from mine in terms of stiffness.